JP3786047B2 - Car navigation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle navigation device.
[0002]
[Prior art]
As a conventional technique, there is an in-vehicle navigation device disclosed in Japanese Patent No. 2840327. When the vehicle is stopped, this navigation device displays the narrow streets in the normal display mode. On the other hand, when the vehicle is traveling, for example, the pallet color of the narrow streets is set as the background color. It is changed to a closer one to reduce the visibility of narrow streets. In this way, the conventional in-vehicle navigation device reduces the visibility of the narrow street part during traveling, and only displays highways and national roads such as national roads. Therefore, when the vehicle is traveling, the user of the navigation device can easily grasp the road conditions related to the main roads such as national roads and highways without being confused by the detailed map information of the narrow streets. When the vehicle is stopped, the main road and the narrow streets around it can be confirmed.
[0003]
[Problems to be solved by the invention]
The conventional in-vehicle navigation device displays all roads including narrow streets and main roads when stopping, so when traffic jams occur on the main roads, users can use the narrow streets to avoid traffic jams. May be searched.
[0004]
However, narrow streets used as loopholes may be roads that run in residential areas and shopping streets, or roads (school zones) that are used for school attendance. Therefore, when the number of vehicles traveling on narrow streets such as residential areas increases, exhaust gas and noise increase with an increase in traffic volume, resulting in an adverse environmental impact.
[0005]
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide an in-vehicle navigation device that can prevent a user from unnecessarily entering a narrow street such as a residential area. .
[0006]
[Means for Solving the Problems]
The in-vehicle navigation device according to claim 1 includes road map storage means for storing road map data, and display processing means for reading the road map data stored in the road map storage means and displaying it on a display unit. The apparatus is characterized in that it has a display control means for restricting at least a narrow street display with respect to a preset road display of a predetermined area, so that the display mode is different from the road display outside the predetermined area.
[0007]
Thereby, in a predetermined area, it can control that a user chooses a course containing a narrow street based on a road map displayed on a display part. Therefore, it is possible to prevent the user from entering the road designated as a school zone or a road in a residential area composed of narrow streets included in the predetermined area. As a result, problems such as exhaust gas and noise associated with increased traffic in residential areas and the like are reduced.
[0008]
Here, the predetermined area is, for example, an area including a living road such as a road in a residential area constituted by a narrow street, a road in a shopping street, or a road designated as a school zone. A narrow street can be defined as the above-mentioned living road or a road having a predetermined width or less. For example, a road having a road width of 5.5 m or less may be defined as a narrow street.
[0009]
As in the vehicle-mounted navigation device according to the second aspect, the display control means can limit the narrow street display by hiding the narrow street in a predetermined area set in advance. As a result, only roads other than the narrow streets (for example, highways and highways such as national roads) are displayed on the road map of the display unit without displaying the narrow streets. With such a display, the user can confirm only the route according to the main road, and therefore can effectively prevent entry into the narrow street.
[0010]
Furthermore, in the in-vehicle navigation device according to the third aspect, the display control means sets the narrow street in the predetermined area set in advance as a display mode in which the visibility is reduced with respect to the road display outside the predetermined area. As a method of reducing the visibility, for example, a narrow street is displayed in a color similar to the background color of the road map displayed on the display unit, displayed in a light color, or displayed in a thin line or a dotted line. (Tone down display). In this case as well, the visibility of the map display on the narrow streets is reduced, and it is effective for preventing entry into the narrow streets by urging the user not to travel on the narrow streets displayed in a tone-down manner in advance. is there.
[0011]
According to the in-vehicle navigation device according to claim 4, it has time information acquisition means for acquiring date and time information, and the road map data is information on date and day of the week on which narrow streets belonging to a predetermined area should be restricted. The display control means belongs to a predetermined area when the time and day of the week acquired by the time information acquisition means coincide with the date and day of the week described in the display restriction data. It is characterized by limiting the display of narrow streets.
[0012]
For narrow streets designated as school zones, it is preferable to reduce the traffic volume especially at the time of school attendance and when leaving school and on the day of the week. In addition, narrow streets that pass through shopping streets are often crowded in the evening. As described above, regarding narrow streets in school zones, residential areas, and shopping streets, it is possible to restrict the passage more accurately by restricting the display especially on busy hours and days of the week. Furthermore, by limiting the road display only when necessary, it is possible to minimize a decrease in convenience for the user of the in-vehicle navigation device.
[0013]
The on-vehicle navigation device according to claim 5 is a road map storage means for storing road map data, a display processing means for reading out the road map data stored in the road map storage means and displaying it on the display section, An in-vehicle navigation device having route guidance means for displaying a travel route to a destination together with a road map on a display unit and performing route guidance, wherein at least a narrow street display is limited with respect to a predetermined area road display. In addition, the display control means has a display mode different from the road display outside the predetermined area.
[0014]
In this way, even when driving while using the in-vehicle navigation device having the route guidance means, it is possible to prevent unnecessary entry into the narrow street by restricting the display of the narrow street in the predetermined area. Can do. Even when restrictions are imposed on the display of narrow streets, the route guidance can be performed using the main road, so that the user can travel to the destination according to the guided travel route.
[0015]
Since the configuration and operation of the in-vehicle navigation device described in claims 6 to 8 are the same as those of the in-vehicle navigation device described in claims 2 to 4, description thereof is omitted.
[0016]
According to the in-vehicle navigation device of the ninth aspect, when the destination is located within a predetermined area set in advance, the display control means converts the road display within the predetermined area to the road display outside the predetermined area. The display mode is the same.
[0017]
Thereby, even when the destination is located along the narrow street in the predetermined area, the user can accurately set the destination along the narrow street. In addition, when a route is directed to a destination set along a narrow street, when the vehicle approaches the destination, a road map including the narrow street around the destination is displayed. Thus, the user can travel along the route to the destination.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an in-vehicle navigation device according to an embodiment of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a block diagram showing a schematic configuration of an in-vehicle navigation device according to an embodiment of the present invention. As shown in the figure, the in-vehicle navigation device of this embodiment includes a position detector 1, a map data input device 6, an operation switch group 7, and a control circuit 8 connected thereto. Further, an external memory 9 connected to the control circuit 8, a display device 10, an external information input / output device 11, and a remote control sensor 12 are provided. The control circuit 8 is configured as a normal computer, and includes a well-known CPU, ROM, RAM, input / output circuit, and a bus line for connecting these configurations. In the ROM, a program to be executed by the control circuit 8 is written, and a CPU or the like executes predetermined arithmetic processing according to this program. The program can be acquired from the external information input / output device 11 or can be acquired from the outside via the external memory 9.
[0020]
The position detector 1 includes a known geomagnetic sensor 2, a gyroscope 3, a distance sensor 4, and a GPS receiver 5 for GPS (Global Positioning System) that detects the position of the vehicle based on radio waves from a satellite. Have. Since these have errors of different properties, they are configured to be used while being complemented by a plurality of sensors. Depending on the accuracy of each sensor, the position detector 1 may be configured as a part of the above-described ones, and further includes a rotation sensor that detects the steering position of the steering, a wheel sensor that detects the rotation speed of each rolling wheel, and the like. It may be used.
[0021]
The map data input device 6 is a device for inputting various types of map data such as road data and landmark data to the control circuit 8. The map data input device 6 includes a storage medium for storing various types of map data. As the storage medium, a CD-ROM or a DVD-ROM is generally used depending on the amount of data, but a memory card or hard disk is used. Such a medium may be used.
[0022]
Here, the structure of road data is demonstrated using FIG. As shown in FIG. 2, the road data 6a includes a link ID with a unique number for each road, link coordinate data, node coordinate data, road type data indicating a road type such as an expressway or a national road, road width data, etc. It consists of each data. Among these, the link of the link coordinate data is obtained by dividing each road on the map into a plurality of nodes by nodes indicating intersections, branching points, etc., and defining two nodes as links. The link coordinate data describes the start and end coordinates of this link. When a node is included in the middle of the link, the node coordinates are described in the node coordinate data. Although not shown, the landmark data is configured as data in which a place name, a building name, a road name, and the like are associated with the corresponding coordinates on the map.
[0023]
The display device 10 is configured by, for example, a liquid crystal display, and is input from the map data input device 6 and a host vehicle mark displayed on the screen of the display device 10 based on the current position of the vehicle detected by the position detector 1. Map data and additional data such as a guide route to be displayed on the map are displayed.
[0024]
The external information input / output device 11 is a device that receives information provided from outside, such as VICS (Vehicle Information and Communication System), and transmits information to the outside. Information received from the outside is processed by the control circuit 8 and, for example, traffic jam information, regulation information, and the like are displayed superimposed on a map. If necessary, the information processed by the control circuit 8 is output from the external information input / output device 11.
[0025]
The remote control sensor 12 receives various operation signals from a remote control terminal (hereinafter referred to as “remote control”) 13 and outputs it to the control circuit 8. The operation switch group 7 is configured as a touch switch or a mechanical switch integrated with the display device 10, for example, and is used for various inputs. For example, the in-vehicle navigation device according to the present embodiment has a so-called route guidance function, and when the destination position is input by the remote controller 13 or the operation switch group 7, the optimum route to the destination is determined from the current position as the departure point. Is automatically selected to form a travel route, and the travel route is displayed on the display device 10.
[0026]
Next, a target road search process for searching for a road that belongs to an area where display restriction is to be performed and is subject to display restriction when displaying a road map on the display device 10, which is a feature of the present invention, and a target A display control process for controlling the display of the road will be described with reference to the functional block diagram of FIG. 2 and the flowchart of FIG.
[0027]
As shown in FIG. 3, first, when the vehicle-mounted navigation device is turned on, initial setting is performed (step S1). The initial setting performed here includes initialization processing of various sensors and processing for establishing a communication link with the outside such as GPS and VICS.
[0028]
When the initial setting is completed, the current position of the host vehicle is detected (step S2). The current position of the host vehicle is detected by the position detector 1, and the detected position by the GPS receiver 5 is acquired in the same form as the coordinate data (latitude and longitude) of the road data described above. In addition, the geomagnetic sensor 2, the gyroscope 3, and the distance sensor 4 simultaneously acquire information related to the traveling direction and travel distance of the host vehicle, calculate coordinate data of the current position by autonomous navigation, and perform map matching with road data. To improve the detection accuracy of the current position.
[0029]
Subsequently, it is determined whether or not the user desires route guidance (step S3). Here, when the user desires route guidance, route search processing (step S4) is executed to create an optimum route from the current position to the destination. On the other hand, if route guidance is not desired, the process moves to step S5.
[0030]
Based on the coordinates of the current position of the host vehicle, landmark data and road data around the host vehicle are read (step S5). This data is read by the data reading unit 8b shown in FIG. 2, and road data and the like corresponding to the scale of the road map set by the operation switch group 7 and the like are read. Therefore, first, the set scale is read via the command interpreter 8a, and then the landmark data and road data necessary for drawing the road map of the set scale are read.
[0031]
For example, assume that road data around the host vehicle shown in FIG. 4 is read. When a road map is displayed on the display 10 based on this road data, the road map shown in FIG. The school mark 15 is read from the landmark data.
[0032]
Next, a target road search process (step S6) for searching for a road that belongs to an area where display restriction should be performed and that is subject to the display restriction will be described with reference to the examples of FIGS. First, from the road data around the host vehicle shown in FIG. 4, the road data that belongs to the area where display is restricted and is subject to display restriction is searched. As described above, this area can be defined as an area including any one of residential roads such as roads in residential areas constituted by narrow streets, roads in shopping streets, and roads designated as school zones. In the present embodiment, as an example, an area 16 within a radius of 1 km centered on a school as shown in FIG. The area where the display restriction should be performed is not limited to the example of the present embodiment. For example, an area having a radius of a predetermined distance centered on a shopping street, a residential area, or the like, or a school zone designated by an administrative organization is an area. Or an area may be defined based on the land (land type such as commercial land, first type residential land, etc.).
[0033]
Next, the road to which the start or end coordinates of the link or node coordinates in the middle of the link belong in this area 16 (that is, the link referred to as road data in FIG. 4) is detected from the road data shown in FIG. In this embodiment, as is clear from FIG. 5A, roads with link IDs L2, L3, L4, L5, and L6 are detected as roads belonging to an area where display is restricted. Subsequently, a road (that is, a narrow street) subject to display restriction is searched from the roads L2, L3, L4, L5, and L6. Here, as shown in FIG. 4, the road type in the present embodiment stores the road type for each road. As this road type, an expressway, a toll road, a national road, a prefectural road, a narrow street, and the like are stored. Therefore, by searching for this road type, the narrow streets L4, L5, and L6 are selected as roads on which display restrictions should be made.
[0034]
Subsequently, in step 7, it is determined whether or not a road for which display restriction is to be performed is selected in step S6. In the present embodiment, since the roads L4 to L6 are selected, the process moves to the display control process (step S8). If a road to be subjected to display restriction is not selected, the process proceeds to the display process (step 9).
[0035]
The display control process in step S8 is executed in the road display setting processing unit 8c in FIG. Here, a process for limiting the map display data to be transmitted to the data display unit 8d is performed. For example, in order to hide the display restriction target roads L4 to L6, the map display data obtained by thinning out the road data of L4 to L6 from the map display data transmitted from the road display setting processing unit 8c is displayed as data. To the unit 8d. As a result, a road map in which the roads L4 to L6 as shown in FIG. 5B are not displayed through the display process (step S9) executed by the data display unit 8d is displayed on the screen of the display device 10. Is done.
[0036]
In addition, in order to reduce the visibility of the user, the display color of L4 to L6, which is the road subject to display restriction, is made similar to the background color, a light display color is used, or a thin line or dotted line is displayed (tone) Map display data that is displayed down) may be transmitted to the data display unit 8d. Thereby, L4 to L6, which are roads subject to display restriction, are displayed in a tone-down manner compared to other road displays. FIG. 5C is an example in which L4 to L6, which are display-restricted roads, are displayed with dotted lines (tone-down display).
[0037]
In this way, the user can read the landmark data and road data around the vehicle, search for roads belonging to the area to be restricted from the road data, and limit the map display data of the target road. It is possible to prevent entry into school zones and narrow streets in residential areas. In addition, by adopting a display mode in which the display of roads subject to display restrictions is toned down, the user's visibility to narrow streets is reduced, and conversely, the visibility of highways is improved. Will use the route. As a result, entry into a narrow street can be prevented.
[0038]
(Modification 1)
As shown in FIG. 6, when the current position of the host vehicle approaches the destination 17 during route guidance, when the destination 17 is located in the above-mentioned area, the original convenience of the in-vehicle navigation device is increased. It is desirable not to change the display mode in consideration. In the process of this modification, in the display control process (step S8) of FIG. 3, it is first determined whether or not the coordinates of the destination are located within the area, and as a result of the determination, the destination is located within the area. In this case, processing that does not change the display mode is executed.
[0039]
Thereby, the narrow street near the destination 17 is displayed in the same display manner as other road displays, and the user can travel according to the displayed route.
[0040]
(Modification 2)
An example will be described in which road display is limited to a time zone or day of the week in a specific area.
[0041]
The car navigation device of this modification has a time update unit 8e. As shown in FIG. 2, the time update unit 8e is built in the control circuit 8, and updates the date and day of the week as needed. Then, the road display setting processing unit 8c acquires the date / time and day information from the time updating unit 8e. The time update unit 8e can be reset by the user in the initial setting (step S1) in FIG.
[0042]
Further, as shown in FIG. 7, in this modification, a map of an area to be subjected to display restriction is provided, and display restriction data is added to each area of this map. This display restriction data is added to an area where display restriction should be performed only in a specific time zone and day of the week. For example, for the area designated as the school zone, the time zone and day of the week are set so that the display is restricted in the time zone from 7:00 am to 9:00 am excluding Saturday and Sunday.
[0043]
Then, in the display control process (step S8) of FIG. 3, the current date and day of the week are acquired from the time update unit 8e, and whether the acquired date and day of the week match the time zone and day of the week in the display restriction data of each area. Judge whether. When the date and day of the week coincide with each other, display control is performed such that the narrow streets belonging to this area are not displayed or are displayed in a tone-down manner. If they do not match, display control is not performed.
[0044]
In this way, by performing display control only during busy hours and days of the week, it is possible to restrict traffic more accurately while suppressing a decrease in convenience for the user of the car navigation device.
[0045]
(Modification 3)
In the above-described embodiment and the like, an area for display restriction regarding a narrow street is set, and a narrow street in the area is selected and subjected to display restriction. However, the above-described area may be configured by adding display restriction data to each road and a set of roads to which the display restriction data is added. That is, the car navigation device of the present modification has a time update unit 8e as in the second modification. Further, as shown in FIG. 8, in the road data of this modification, display restriction data is added to each narrow street to be subjected to display restriction. Then, display restriction is performed based on the date and time of the display restriction data and the day of the week. Also in this modified example, in the display control process (step S8) of FIG. 3, the time zone and day of the road data display restriction data displayed on the display device 10 and the time and day of the week acquired from the time update unit 8e are obtained. It is determined whether they match. If they match, display control is performed for the road that is subject to display restriction. If they do not match, the road map is displayed based on the road data shown in FIG. 8 without performing display control.
[0046]
In the road data around the own vehicle shown in FIG. 8, the road type is stored for each road. The road type is designated as a school zone and corresponds to a narrow street with a narrow road width. Is stored as “school zone”. A road corresponding to a narrow street with a narrow road width is stored as a “residential area”. In this way, by storing the road type of the road data as a road type that can be directly grasped as a road that is subject to display restriction, the road that is subject to display restriction can be displayed without setting an area. In the target road search process (step S6) shown in FIG.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic electrical configuration of an in-vehicle navigation device according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of a control circuit 8 according to the embodiment of the present invention.
FIG. 3 is a flowchart of the in-vehicle navigation device according to the embodiment of the present invention.
FIG. 4 is a data configuration diagram of road data according to the embodiment of the present invention.
FIG. 5 is a display image diagram of a road map according to the embodiment of the present invention.
FIG. 6 is a display image diagram of a road map in which the destination is located along a narrow street according to the embodiment of the present invention.
FIG. 7 is a map configuration diagram of an area subject to display restriction according to the embodiment of the present invention.
FIG. 8 is a road data configuration diagram to which display restriction data is added according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Position detector 2 Geomagnetic sensor 3 Gyroscope 4 Distance sensor 5 GPS receiver 6 Map data input device 7 Operation switch group 8 Control circuit 9 External memory 10 Display device 11 External information input / output device 12 Remote control sensor 13 Remote control 14 Own vehicle mark 15 School mark 16 Area 17 Destination

Claims (9)

Road map storage means for storing road map data;
An in-vehicle navigation device having display processing means for reading road map data stored in the road map storage means and displaying it on a display unit,
An in-vehicle navigation device comprising: a display control unit that restricts at least a narrow street display with respect to a predetermined road display in a predetermined area and has a display mode different from a road display outside the predetermined area. The in-vehicle navigation device according to claim 1, wherein the display control means hides the narrow street in the predetermined area set in advance. The in-vehicle navigation system according to claim 1, wherein the display control means sets the narrow street in the predetermined area set in advance to a display mode in which visibility is reduced with respect to a road display outside the predetermined area. apparatus. It has time information acquisition means for acquiring date and day information,
The road map data has display restriction data in which information on the date and day of the week and the day of the week on which narrow streets belonging to the predetermined area should be restricted is described,
The display control means restricts the display of narrow streets belonging to the predetermined area when the time and day of the week acquired by the time information acquisition means coincide with the date and day of the week described in the display restriction data. The in-vehicle navigation device according to any one of claims 1 to 3, which is added. Road map storage means for storing road map data;
Display processing means for reading road map data stored in the road map storage means and displaying the data on a display unit;
An in-vehicle navigation device having a route guidance unit that displays a travel route from a departure point to a destination together with the road map on the display unit and performs route guidance;
An in-vehicle navigation device comprising: a display control unit that restricts at least a narrow street display with respect to a predetermined road display in a predetermined area and has a display mode different from a road display outside the predetermined area. 6. The in-vehicle navigation device according to claim 5, wherein the display control means hides the narrow street in the predetermined area set in advance. 6. The in-vehicle navigation according to claim 5, wherein the display control means sets the narrow street of the predetermined area set in advance to a display mode in which the visibility is reduced with respect to the road display outside the predetermined area. apparatus. It has time information acquisition means for acquiring date and day information,
The road map data has display restriction data in which information on the date and day of the week and the day of the week on which narrow streets belonging to the predetermined area should be restricted is described,
The display control means restricts the display of narrow streets belonging to the predetermined area when the time and day of the week acquired by the time information acquisition means coincide with the date and day of the week described in the display restriction data. The in-vehicle navigation device according to any one of claims 5 to 7, characterized by being added. When the destination is located within the predetermined area, the display control means sets the road display of the predetermined area to the same display mode as the road display outside the predetermined area. The in-vehicle navigation device according to any one of claims 5 to 8.

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